Well, technically the 'jewelers' rough is red. But yes, there are different colors for different grits. A green specifically for stainless steel, as well as the black / grey / white you mentioned, a brown, a blue, maybe even some others.
Of course, it also depends on how high of a shine the OP prefers. JMO, probably start off with the green to get rid of minor scratches, etc., then move to something like red if a high polish is preferred. I prefer to remove scratches, etc. but leave something of a smooth, matte finish rather an a mirror finish. But that's my 'thing'.
I like the bars because they're easy to manipulate with handguns, which tend to have have lots of 'nooks & crannies'. While polishing the larger areas, the bar can be worked into a 'pencil point' to use in those tight spots. They're also less messy than polishing creams and compounds, IMO. And as noted, they're specifically made for fine metals (but there are bars for plastics). AND, they're pretty cheap, with a 4 oz. bar costing in the neighborhood of $2 (depending on where it's purchased, of course)
This sounds like exactly what I need. Could you share any info about where you source the rouge sticks. Wondering if its locally sourced or online etc. Just want to narrow down the search. Here in Columbus we don't have much of a history of machining or production by industry and we lack a lot of options for useful materials.Thx